1 /* 2 * Copyright (c) 2008, 2011, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 */ 23 24 import java.nio.file.*; 25 import java.nio.file.attribute.*; 26 import java.io.IOException; 27 import java.util.*; 28 29 /** 30 * Unit test for Files.walkFileTree to test SKIP_SIBLINGS return value. 31 */ 32 33 public class SkipSiblings { 34 35 static final Random rand = new Random(); 36 static final Set<Path> skipped = new HashSet<Path>(); 37 38 // check if this path's directory has been skipped 39 static void check(Path path) { 40 if (skipped.contains(path.getParent())) 41 throw new RuntimeException(path + " should not have been visited"); 42 } 43 44 // indicates if the siblings of this path should be skipped 45 static boolean skip(Path path) { 46 Path parent = path.getParent(); 47 if (parent != null && rand.nextBoolean()) { 48 skipped.add(parent); 49 return true; 50 } 51 return false; 52 } 53 54 public static void main(String[] args) throws Exception { 55 Path dir = Paths.get(args[0]); 56 57 Files.walkFileTree(dir, new SimpleFileVisitor<Path>() { 58 @Override 59 public FileVisitResult preVisitDirectory(Path dir, BasicFileAttributes attrs) { 60 check(dir); 61 if (skip(dir)) 62 return FileVisitResult.SKIP_SIBLINGS; 63 return FileVisitResult.CONTINUE; 64 } 65 @Override 66 public FileVisitResult visitFile(Path file, BasicFileAttributes attrs) { 67 check(file); 68 if (skip(file)) 69 return FileVisitResult.SKIP_SIBLINGS; 70 return FileVisitResult.CONTINUE; 71 } 72 @Override 73 public FileVisitResult postVisitDirectory(Path dir, IOException x) { 74 if (x != null) 75 throw new RuntimeException(x); 76 check(dir); 77 return FileVisitResult.CONTINUE; 78 } 79 }); 80 } 81 }